Permian–Triassic extinction in the context of "Ocean acidification"

The Holocene or Anthropocene extinction is an ongoing extinction event caused by human activity during the current geological epoch, impacting diverse families of plants and animals, including mammals, birds, reptiles, amphibians, fish, and invertebrates, as well as both terrestrial and marine species. It is sometimes also called the sixth mass extinction (or seventh if counting the Capitanian and End Permian extinctions separately).

Current extinction rates are estimated at 100 to 1,000 times higher than natural background extinction rates and are accelerating. The Holocene extinction was preceded by the Late Pleistocene megafauna extinctions (lasting from 50,000 to 10,000 years ago), in which many large mammals – including 81% of megaherbivores – went extinct, a decline attributed at least in part to human (anthropogenic) activities. There continue to be strong debates about the relative importance of anthropogenic factors and climate change, but a recent review concluded that there is little evidence for a major role of climate change and "strong" evidence for human activities as the principal driver. Examples from regions such as New Zealand, Madagascar, and Hawaii have shown how human colonization and habitat destruction have led to significant biodiversity losses.

The Capitanian mass extinction, also known as the end-Guadalupian, Guadalupian-Lopingian, or pre-Lopingian extinction began around 262 million years ago with its most intense pulse peaking at 259 million years ago, marking the end of the Capitanian stage and Guadalupian (Middle Permian) epoch of the Permian. Historically conflated with the better-known Permian–Triassic extinction, it was only recognised as a distinct event in 1994. Despite this, the mass extinction is believed to be the third-largest of the Phanerozoic in terms of the percentage of genera (33-35%) and species (60-63%) lost after the end-Permian and Late Ordovician mass extinction, while being the fifth worst in terms of ecological severity. The global nature of the Capitanian mass extinction has been called into question by some palaeontologists as a result of some analyses finding it to have affected only low-latitude taxa in the Northern Hemisphere.